PSI - Issue 84

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 84 (2026) 1198–1205

© 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Conference Keywords: Viaduct; special inspection; Model Updating; Structural Assessment; Static Load Test. Abstract The paper presents an integrated diagnostic methodology combined with subsequent numerical modelling, aimed at investigating the response of a prestressed concrete viaduct with low residual prestressing reserves. The study is structured into two sections: the first is devoted to a comprehensive preliminary investigation campaign, including visual inspections, geometric surveys, endoscopic explorations, and semi-destructive tests. In the second phase, a finite element model, calibrated on the results of the preliminary investigations, is employed within a model updating process to define the numerical behavior of the structure based on experimental results obtained from static load tests. This approach aims to improve the reliability of predictive assessments, allowing for a more realistic representation of stiffness degradation and residual prestressing effects in existing prestressed concrete bridges. 1. Introduction The aging of Italy’s infrastructure assets, combined with the increasing stresses induced by heavy traffic, requires the adoption of increasingly advanced diagnostic and monitoring methods. This approach leads to an enhanced knowledge of structural degradation that can be used in reliable and accurate assessments of structural behavior. These III Fabre Conference: Existing Bridges, Viaducts, and Tunnels: Research, Innovation, and Applications Advanced Diagnostic Approaches and Monitoring Strategies for Assessing Deterioration in Existing Bridges: Application to the Tevere viaduct Diego Esposito a, *, Elisabetta Frijia b , Salvatore Sofia a , Paolo Tortolini c a Anas S.p.A, Roma 00185, Italy b Università la Sapienza, Roma 00185, Italy c Tecne S.p.A., Roma 00159, Italy

* Corresponding author. Tel.: +39-06-4446-3716 E-mail address: di.esposito@stradeanas.it

2452-3216 © 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Conference 10.1016/j.prostr.2026.06.153